Dark spot on back, no pain, sinus, headache. Is this related to liver?

I am an 37 year old African American female and recently discovered dark spots on my back. Some are very tiny. One is about the size of a quarter and another about a dime. I don t feel any pain with this nor do i have any soreness; however, for over a week now I have been dealing with sinus (which is not often) headaches . Could this have something to do with my liver? Thank you.